408
FZUS63 KMKX 311955
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
255 PM CDT Mon Aug 31 2026

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON Lake Michigan.

Waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the wave, along with the
average height of the highest 10% of the waves which will
occasionally be encountered.

.SYNOPSIS...

Low pressure of 29.5 inches over the Canadian Prairies will lift
northeastward into the Hudson Bay through Tuesday, bringing
continued breezy southwest winds to Lake Michigan through
Tuesday. With a warm, moist airmass moving northward, patchy dense
fog is also expected overnight into Tuesday morning. A front from
the Canadian low will settle over the Lake tonight, lingering
through the week and allowing for on-and-off thunderstorms
through Friday. Exact placement remains uncertain day to day, and
will set the stage for placement of daily storms. Meanwhile, high
pressure around 30.0 inches of the Southeast U.S. will keep winds
generally southerly through Wednesday. Thursday, low pressure
finally exits into the Canadian Maritimes, bringing the front into
the Ohio Valley and allowing winds to shift to northeasterly,
remaining northeasterly through Friday.

LMZ261-362-364-366-563-565-567-868-010315-
Lake Michigan from Seul Choix Point to Rock Island Passage 5 NM
offshore to Mid Lake-
Lake Michigan South of a line from Seul Choix Point to the
Mackinac Bridge and north of a line from Charlevoix MI to South
Fox Island 5 NM offshore-
Lake Michigan from Charlevoix to Point Betsie MI 5 NM offshore to
Mid Lake-
Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to
Mid Lake-
Lake Michigan from Rock Island Passage to Sturgeon Bay WI-
Lake Michigan from Sturgeon Bay to Two Rivers WI 5 NM offshore to
Mid Lake-
Lake Michigan from Two Rivers to Sheboygan WI 5 NM offshore to
Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid
Lake-
255 PM CDT Mon Aug 31 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...South winds 10 to 20 kt becoming southwest 10 to 15 kt
after midnight, then becoming northwest late. Chance of showers
and slight chance of thunderstorms this evening. Patchy fog.
Waves 3 to 5 ft subsiding to 2 to 4 ft.
.TUESDAY...Northeast winds 5 to 10 kt veering to south late in
the morning, then increasing to 10 to 15 kt early in the
afternoon becoming south 10 to 15 kt late. Patchy fog in the
morning. Waves 1 to 3 ft.
.TUESDAY NIGHT...South winds 10 to 15 kt veering to west 5 to
10 kt. Waves 1 to 2 ft.
.WEDNESDAY...Northwest winds 10 to 15 kt becoming north. Chance
of showers. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...Northeast winds 5 to 10 kt. Waves 1 ft or
less.
.THURSDAY...Northeast winds 5 to 10 kt increasing to 10 to 15 kt.
Chance of showers in the afternoon. Waves 1 ft or less.
.THURSDAY NIGHT...Northeast winds 10 to 15 kt diminishing to 5 to
10 kt. Chance of showers. Waves 1 ft or less.
.FRIDAY...East winds 5 to 10 kt becoming northeast 10 to 15 kt.
Waves 1 ft or less.
.SATURDAY...East winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-010315-
Lake Michigan from Michigan City IN to St. Joseph MI 5 NM
offshore to Mid Lake-
Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore
to Mid Lake-
Lake Michigan from Port Washington to North Point Light WI 5 NM
offshore to Mid Lake-
Lake Michigan from North Point Light to Wind Point WI 5 NM
offshore to Mid Lake-
Lake Michigan from Wind Point WI to Winthrop Harbor IL 5 NM
offshore to Mid Lake-
Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5 NM
offshore to Mid Lake-
Lake Michigan from Wilmette Harbor IL to Michigan City IN 5 NM
offshore to Mid Lake-
Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid
Lake-
Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to
Mid Lake-
Lake Michigan from Holland to Grand Haven MI 5 NM offshore to Mid
Lake-
Lake Michigan from South Haven to Holland MI 5 NM offshore to Mid
Lake-
Lake Michigan from St. Joseph to South Haven MI 5 NM offshore to
Mid Lake-
255 PM CDT Mon Aug 31 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Southwest winds 10 to 20 kt diminishing to 5 to 10 kt.
Waves 3 to 5 ft subsiding to 2 to 4 ft.
.TUESDAY...West winds 5 to 10 kt becoming south 10 to 15 kt.
Patchy fog in the morning. Waves 1 to 3 ft.
.TUESDAY NIGHT...Southwest winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 to 2 ft.
.WEDNESDAY...South winds 10 to 15 kt. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...Northwest winds 10 to 15 kt becoming north.
Chance of showers overnight. Waves 1 to 2 ft.
.THURSDAY...Northeast winds 5 to 10 kt becoming north 10 to
15 kt. Chance of showers and thunderstorms in the morning. Waves
1 to 2 ft.
.THURSDAY NIGHT...Northeast winds 10 to 15 kt becoming east 5 to
10 kt. Chance of showers and thunderstorms. Waves 1 to 2 ft.
.FRIDAY...East winds 10 to 15 kt becoming northeast. Chance of
showers. Waves 1 to 2 ft.
.SATURDAY...East winds 10 to 15 kt. Waves 1 to 3 ft.

$$

LMZ761-010315-
MAFOR 3122/
MICHIGAN NORTH 11430 11410 11510 11600 11800 19804 11300 12410. A
chance of showers this evening. Waves 3 to 5 feet subsiding to 1
to 3 feet tonight. Waves 2 feet or less Tuesday.

MICHIGAN SOUTH 11430 11520 11510 11500 11600 12510 11410. Waves 3
to 5 feet subsiding to 1 to 3 feet tonight. Waves 2 feet or less
Tuesday.

$$


WFO MKX

Experimental modernized open lake forecast is available online at
weather.gov/mkx/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes